According to a report at DigiTimes, AMD is set to release its RD790 chipset by the end of September. Asus and Gigabyte will apparently lead the motherboard charge, and if their current product lines are any indication, plenty of different RD790 flavors should be available.
RD790 is being fabbed using 65nm process technology by TSMC and will support PCI Express 2.0 and HyperTransport 3.0. However, according to DigiTimes, the chipset will initially launch with the old SB600 south bridge. The SB600 has been around for close to a year and a half, but AMD's new SB700 south bridge apparently won't be ready until the end of November.